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Note 6 - Aemetis Biogas LLC, Series A Preferred Financing and Variable Interest Entity (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Jan. 01, 2023
Aug. 08, 2022
Dec. 20, 2018
Mar. 31, 2023
Dec. 31, 2022
Series A Preferred Units Value       $ 122.5 $ 116.0
Total Assets of ABGL Company       $ 78.8  
Carbon Revolving Line [Member]          
Repayments of Debt   $ 7.3      
Extinguishment of Debt, Gain (Loss), Net of Tax   (49.4)      
Preferred Units Series A [Member]          
Common Units Authorized (in shares)     11,000,000    
Common Units Issued (in shares)     6,000,000    
Preferred Unit Dividend Rate Per Dollar Amount (in dollars per share)     $ 0.50    
Conversion of Stock, Shares Issued (in shares)     1,200,000 5,000,000  
Maximum Number of Shares (in shares)     5,000,000    
Redeemable Noncontrolling Interest, Equity, Preferred, Redemption Value per Unit (in dollars per share)     $ 15    
Free Cash Flow Generated by ABGL     75.00% 100.00%  
Redeemable Noncontrolling Interest Equity Redemption Value, Total     $ 90.0    
Fees and Commission Transfer Agent     0.9    
Debt Instrument, Collateral Amount     $ 30,000.0    
Preferred Units Series A [Member] | First Tranche [Member]          
Preferred Units, Issued (in shares)       3,200,000  
Preferred Units Issued Value       $ 16.0  
Preferred Units Series A [Member] | Second Tranche [Member          
Preferred Units, Issued (in shares)       2,800,000  
Preferred Units Issued Value       $ 14.0  
Stock Redeemed or Called During Period, Shares (in shares)       20,000  
Preferred Units Redeemed, Value       $ 0.3  
Series A Preferred Stocks [Member]          
Common Units Issued (in shares)     6,000,000    
Common Units Issuance Value (in dollars per share)     $ 5.00    
Proceeds from Issuance of Common Units     $ 30,000.0    
Preferred Units Reserved for Future Issuance (in shares)     5,000,000    
Preferred Units Series A Redeemable By December 31, 2022 [Member]          
Preferred Units Issued Value $ 159.0 116.0      
Preferred Units Series A Redeemable By December 31, 2022 [Member] | ABGL [Member]          
Preferred Units Issued Value $ 125.0        
Preferred Units Series A Redeemable By September 30, 2022 [Member] | ABGL [Member]          
Preferred Units Issued Value   $ 106.0